Task chair backrest and armrest assembly



FIG. 1 is a front perspective view of a task chair backrest and armrest assembly according to our new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a top view thereof.

Features shown in dashed lines form no part of the claimed design. 

The ornamental design for a task chair backrest and armrest assembly, as shown. 